Over the past decade, the pollution of rivers in China has been effectively controlled. The percentage of grade I (highest water quality) to III cases increase greatly, and the pollutant concentrations have generally declined. However, the water quality and ecological status of lakes have not been improved as expected, despite massive efforts on pollution management during 2008-2018. “This contradiction between the continuous decline of water quality and a large amount of investment in water pollution control and ecological restoration confused academia and government departments,” says Dr. Boqiang Qin (Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences).
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Source: Phys.org